设P(m,n)
S=1/2*|F1F2|*|n| |F1F2|=2
|n|=1 n^2=1 n=±1
代入椭圆
m^2/5+n^2/4=1 m^2=15/4 m=±√15/2
点P的坐标 (1,√15/2) (1,-√15/2) (-1,√15/2) (-1,-√15/2)